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G. SMITH.l @e s Y QUADRUPLBX TELEGRAPH.

No. 291,236. Patenged Jan. l, 1884.

WITNESSES INVENTOR MWQM y L www N. PETERS Fhnm-mhumpher4 washingmn. DAC.

3 Sheets-Sheet 3.

(No Model.)

G. SMITH. y QUADRUPLEX TELEGBABH.

VPa'JtentedV Jam.l '1884'.v

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WITNESSES N4 PETERS. Phawunmgmphar, wammgmn, DJ;

f1' VViiv-Iren STATE-s Pari-DNT @rr-ien,

Gnnnirr sMirH, or ASTORIA, New Youn.`

QUADRUPLEX T ELEGRAPH.

SPECIFICATION- forming part of Letters Patent No. 291,236, dated January 1., 1884.

Application [lcd May 22, 1883. (No model.)

To. cir/Z whom t may concern.-

l"Be ittknown that'I, GERRITT SMITH, a citi- #zenr ofthe United States, residing in Astoria, in the county of lQueens and State of New York, have `invented'certain `new and useful Im- Aprovenients in Diplex or Quadruplex Tele- -graphs, of which the following is a specification.l

, :Theobject ofmy invention is to provide an improved receiving systermwhereby two sepa- Vsrateimes'sages orseries ofsignals simultane- 'ously transmitted from one station over asingleE electrical conductor may be received at a second-station with out interference; and it consists in a'novel arrangement of receiving apparatus -atA one station, in combination with a `main-battery in two sections and two transmitting-instruments ata second station., ca-

:pable of directing upon the line a current of twof different strengths and varying polarity. The receiving system in general use :at the .present time, in connection with a transmitvtingsystem of the nature indicated, consists of .two separate. `and locally-independent relays, one polarized and responding only to reversals, the second neutral and responding only to changesv in current strength; and it fhas `been found that when, in the course of transmission, a reversal in the polarity of the `mainline `current takes place while a strength of current is upon the line for influencing the neutral: relay, there will be a short interval, during which a cessation of magnetism in the `neutral cores will occur, and thearmature of theneutral relay will tend to fall back, thus causing a false signal. My presentV arrangement of receiving apparatus is not subject to thisidifculty, and while it is adapted to re- `fceiv'eand` register two separate series ofl sigirnals, itV may .be advantageously employed to replace the neutral relay, when such relay: is used, as above described, andto receive-one seriesoffsignals only, in connection-with a 'separate and locally-independent polarized re-` lay for receiving a second series of signals, thus obviating the difficulty referred to.` My invention is also capable, when used in connectionV with anyof the well-knownV forms of dupleX telegraphy, of transmitting andreceiving goafourmessages or seriesofsignals-two in-feach' 4ranged transmitting-instruments.

direction-simultaneousl y upon a single elec :trical conductor.

'In Letters Patent of the United States No. 189,276, dated April 3, 187 7, I have described a transmitting system wherein two transmit- `ters capable of independent action are` soarranged with reference to eachother and'to a main battery or batteries that their separate and combined action may produce four: distinct electrical conditions in the main line,- .differing from each other inrespect to the strength or polarity of the current, or both; and I have f selected this arrangement of the transmitting system for illustrating my present invention.

.My arrangement of receiving apparatus,

which I term a compound relay,77 consists in combining two electro-magnets and `an armature for' each in such relative positions that the respective armatures, each inlucnced'and controlled by an adjustable retractile'spring; and appropriately situated contact-stops,un

der certain conditions of the mainline current will mechanically connect and cao-operate to inuence local circuits containing two receiving jsounders, the said armatures thus, with refer- :ence to each other and the aforesaid contactstops, assuming four different positions' corre-` sponding to the four possible positions of the transmitters at the distant station.

Figure l is a plan view of my compound relay, showing the two receiving-Sounders:and their electrical connections with suitably-,ar-

Figs-:2, 3, and4 show the position of the receivingapparatus` corresponding to the different-,positions of the accompanying transmitters,and Fig. 5 shows my compound relay in connection with a modification of the transmitting system.

kMy compound relay is composed of two elec- Ltro-magnets, R R', situated, respectivelyyupon the ends S ofV permanently-magnetizedisteel bars N S, upon the opposite end, N, ofwhich the armatures r r are pivoted, .the arrangea genees current. The armatures are capable of a lateral movement, 1", being limited by the insulated stops c and d, while r is limited in one direction by the insulated stop e, and in the other by the electrical contact-stopj'. The outer ends of both armatures are provided with suitable contact-points, c and I), and move in the same horizontal and vertical plane. I' nder the influence of the greater strength of current of either polarity the armatures assume an extreme position and are separated. \Vhen the weaker strength of current is upon the line, one armature or thc other, according to the polarity of such current, assumes an extreme position, aided by its retracting-springg the other armature takes a position nearly central,

thus establishing electrical contact between the ends of the two armatures; but it, while the weaker strength of battery is upon the line and the armatures are in the position last described, a reversal of the main-line current occurs, the two armatures, while maintaining electrical contact between themselves, will move to the opposite side, and the local circuit established by such contact between the two armatures will be uninterrupted.

The two receiving-Sounders S and S and their local circuits are connected to the compound relay as follows: S is connected with contact-pointf, the circuit extending through the coils of sounder S, local battery L B,wire 2l 22, to the armature r, the circuit being completed at points f f. S is connected to armature o" by wire 19, the circuit passing through coils of S, local battery L B, wire and 22, to the armature r, circuit being completed through contact-points a and b.

It will be seen by inspection that as both electro-magnets It and R have the same polarity, the main line )I L is passed through them in opposite directions, so that a current of any given polarity will cause the armatures to move in the same direction, their relative position being reversed. The same object would of course be attained by polarizing the electro-magnets with opposite polarities and passing the main line through them in the saine direction. In Fig. l the transmitters K and K are both open and a current of 4 B is to line. Armatures r and 1", in response to the greater strength of positive current, are carried to their extreme positions into contact with the limiting stops c and c, respectively, and both local circuits are open. In Fig. 2 transmitter K is closed and K is open. A current of 4 B is to line. In response to a reversal of the greater strength of current, armature 1" is carried to its opposite extreme position against the limiting-stop d. Armature r is also carried to its extreme position, and electrical contact is made between points f and f whereby the local circuit of sounder S is completed through elements f, S, L B, f2l, 22, r, and f, whereupon sounder S responds. In Fie'. 3 transmitter K is closed and K 1s open. A current of B iiows to line, and armature lr, by reason of the de; creased strength of current, aided by retracting spring s, assumes an extreme position against limiting-stop c. Armature r, acting against the force of spring s, assumes a nearly central position, and connection between the ends c and b of armatures r and r is effected, whereby the local circuit ol" sounder S is completed through the elements u, 7", 1S), S, L B', 20, 22, r, and I), and sounder S responds. In Fig. 4 K and K are both closed. A current of B flows to line. l\rmature r, by reason of the reversal in polarity of current and aided by retractingspring s, assumes an extreme position against electrical eontact-stopf, and the circuit of sounder S is completed at fj". Armature o", acting against the force of retracting-spring s', assumes a nearly central position, and contact between c and I) is made, thus closing the circuit of sounder S,whereby both sounders respond. lt will thus be seen that sounder S responds solely to the op eration ot' transmitter K, and that sounder S rcsponds only to the operation ot' transmitter K.

It is to be observed that if, while the appa ratus is in the position shown in Fig. 3, transmitter K be closed and the apparatus assume the position shown in Fig. 4, no break in the electrical connection between points a and I) will occur, and the signal in process of reception on sounder S will be uninterrupted.

Fig. 5 is a modification of the arrangement of transmitters, also shown in the aforesaid United States Letters Iatent No. 189,276, in which the different electrical conditions of the main line occur as follows: Vith K and K open there is a current from. -1- B; K closed and K open, a current from 3 B; K closed, K open, no current, K and K both closed, a current from B.

The operation of the receiving-instrument and its local connections is in each instance substantially like that described above, eX- cept that springs of the armature i" should be given aresilicncy sufficient to overcome spring s of armature 1'.

In another application I have described and claimed a receiving system composed of the herein-described form of compound relay in combination with a second polarized relay for receiving two simultaneous transmissions, as above referred to.

The apparatus herein described may be combined with well-known means for duplexL tra-nsmission and twoseries of signals in opposite directions, four n all, may thus be transmitted and received.

I do not abandon or dedicate to the public any patentable features set forth herein and not hereinafter claimed, but reserve the right to claim the same by any reissue hereof, or by any subsequent application.

That I claim, and desire to secure by Letters Patent, is#

l. In a diplear telegraph, means for transmitting two strengths of current and for re- IOO vers being operated upon contact of the two armatures, and the other upon contact between one of said armatures and its stationary electrical contact.

2. In a diplex telegraph, the combination of means for transmitting two strengths of cur-4 rent and for reversing either strength of current, a main telegraph-line, an electro-magnetic receiving-instrument having two polar magnets, two armatures adapted to come in contact, a stationary electrical connection to form contact with one of said armatures, and two local Sounders, one of said sounders being operated by connection ofthe two armatures, and i the other upon contact of one of the armatures and its stationary electrical contact. v 3. In a dipleX telegraph, the combination of means for transmitting two strengths of current and for reversing either strength of current, a main line, a relay having two polar electro-magnets, and two respective armatures capable of establishing electrical connection with each other, substantially as described.

4. In a relay for a diplex telegraph, the combination of two polar electro-magnets having two respective armatures capable of establish ing electrical connection, a stationary electrical contact for one of said armatures, and two local Sounders, substantially as described.

5. The combination, in a diplex relay, of two polar electromagnets having armatures R R', capable of establishing electrical connection Sounders S S.

GERRITT SMITH.

Vitnesses:

WVM. B. VnNslzE, WM. AnNoUX. 

